ABC RIFLE COMPANY AR Engraved Ejection Port Dust Cover Assembly 9mm Luger Black. It includes a 4140 steel rod ejection port cover spring and E-clip retaining ring for reliable function. Designed for compatibility with AR-style uppers this version is laser-engraved with AR 9MMin making it ideal for pistol-caliber carbine builds. A perfect upgrade for distinguishing your AR-9 upper with both form and function. Specifications for ABC RIFLE COMPANY AR Engraved Ejection Port Dust Cover Assembly: Manufacturer: ABC RIFLE COMPANY Color: Black Finish: Engraved Gun Model: AR-15 Caliber: 9mm Luger Gun Make: AR Platform Gun Type: Rifle Package Contents: ABC RIFLE COMPANY AR Engraved Ejection Port Dust Cover Assembly What firearm models does the manufacturer say ABC RIFLE COMPANY AR Engraved Ejection Port Dust Cover Assembly is compatible with? The manufacturer says that ABC RIFLE COMPANY AR Engraved Ejection Port Dust Cover Assembly is compatible with AR-15ABC RIFLE COMPANY EPC15-9MM: AR Engraved Ejection Port Dust Cover Assembly 9mm Luger Black